Color Button Control
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This example is useful for setting colours for things. Clicking the button brings up the standard Colour Picker Dialog Box (CColorDialog) with an extra button to un-set colour. When you choose a colour, the button face becomes the colour that was chosen, or a spectrum of colour if the new [Default] button was clicked (which could tell objects to inherit their colour from their parent).

So, where would you use this? If you've used a painting or drawing package, you'll know that objects (such as lines) can assume the colour of the Layer they are in: you could use this button to set the colour of the Layers or the Lines. If the line and the layer both are colourless, you'll need to decide what default colour to use. Other than that, use the Line colour, if it has one - and if it doesn't, use the Layer colour.

The Colour Picker Dialog has an additional button to go back to using Default Colours rather than the User Layer's colour. In the following image, the top (spectrum / rainbow) button indicates a layer using default Layer Colour; The lower button indicates a Green Layer:

The Spectrum is generated by Colors.h which is described in the Colour Conversion Algorithms section.


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 (2048) Last modified: Fri, 05 Jun 2009 16:37:53 +0100